Why weren't they concerned with creating the illusions of depth?

Why is understanding the influence of theory important to being a competent communicator

Acurious child asked his mother: “mommy, why are some of your hairs turning grey? ” the mother tried to use this occasion to teach her child: “it is because of you, dear. every bad action of yours will turn one of my hairs grey! ” the child replied innocently: “now i know why grandmother has only grey hairs on her head.”

If g(x) is the inverse of f(x) and (x) = 4x + 12, what is g(x)?